We have an old shallow well with jet pump. We have low water pressure in the house. The well pumps 5 gallons per minute at the pump but by the time it gets into the house, it is much less than this. We have also noticed surging in the toilet and in the water hose at the pump. In an effort to try to correct some of our problems, I have added air to the tank over the past couple of days but do not know if I have added too much or too little. Can you give me some idea of how much air needs to be added to maintain the correct balance in the system. Also, could you please give me a pump diagnosis which would account for the various problems we are currently experiencing?